具有亚波长模式局域性的全介质反槽波导及其与输入/输出光纤的高效耦合

All-dielectric antislot waveguide with subwavelength mode confinement and its high-efficiency coupling with input/output fiber

由于金属固有的欧姆损耗,表面等离子体波导通常具有较大的传输损耗。基于此,提出了一种全介质反槽波导结构,该波导可以同时实现亚波长模式局域性和理论上无损耗的传输,归一化模式面积可以达到3.4×10^(-2)。另外,为了实现该小尺寸反槽波导与输入/输出光纤的高效耦合,提出了一种高效的耦合方案,耦合效率可以达到92.7%,在y和z方向上1 dB损耗的耦合偏差均约为2μm。

Due to metallic ohmic loss,plasmonic waveguides usually have larger propagation loss.Here,an all-dielectric antislot waveguide was proposed,which can realize subwavelength mode confinement and theoretically lossless propagation simultaneously.A normalized mode area of 3.4×10^(-2) was achieved in the all-dielectric antislot waveguide.Moreover,an efficient coupling scheme between the small-size antislot waveguide and input/output fiber was proposed.An overall coupling efficiency of 92.7%was attained.The misalignment tolerance for 1 dB loss penalty was about 2μm in both y and z directions.